Biology Nervous Coordination MDCAT 2019
PMDC Verified Question 75 of 86
If stimulation is above _, impulses travel to the brain along the sensory neuron.
A
Action Potential
B
Resting Potential
C
Threshold
D
Recovery Period
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Threshold
Concept:

Neurons obey the "all-or-none" principle. An action potential is only fired if a specific voltage criteria is met.

Solution:

  • The threshold potential (usually around -55 mV) is the critical level to which a membrane potential must be depolarized to initiate an action potential. If a stimulus brings the membrane above this threshold, a full impulse is generated and sent to the brain.


Why other options are incorrect:

  • Action Potential: This is the result, not the triggering requirement.


  • Resting Potential: The baseline state. A stimulus must exceed resting potential significantly to reach threshold.

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